Java.sql.sqlsyntaxerrorexception Syntax Error Encountered Limit
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Java.sql.sqlsyntaxerrorexception Syntax Error Encountered At Line 1
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Error 42x01 Syntax Error Encountered
Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Vaadin SQLSyntaxErrorException using JavaDB/Derby: Encountered “LIMIT” at line 1, column 41 up vote 0 down vote favorite Following this tutorial about Vaadin 7 and SQLContainer I encountered the following problem. I am coding inside Netbeans 8.0.2 and would like to use the embedded JavaDB/Derby database over JDBC in this early development stage. I am trying to databind a table in my Vaadin application to show data. Inside init(VaadinRequest vaadinRequest) I call my database() method. import com.vaadin.data.util.sqlcontainer.SQLContainer; import com.vaadin.data.util.sqlcontainer.connection.JDBCConnectionPool; import com.vaadin.data.util.sqlcontainer.connection.SimpleJDBCConnectionPool; import com.vaadin.data.util.sqlcontainer.query.TableQuery; private void database() { System.out.println("database()"); JDBCConnectionPool pool = null; try { pool = new SimpleJDBCConnectionPool("org.apache.derby.jdbc.ClientDriver", "jdbc:derby://localhost:1527/gr", "a", "a", 2, 5); TableQuery tq = new TableQuery("GROCERY", pool); tq.setVersionColumn("OPTLOCK"); SQLContainer container = new SQLContainer(tq); // <-- raises exception //container.setAutoCommit(true); Item i = container.addItem(1); Object props = i.getItemPropertyIds(); } catch (SQLException ex) { Logger.getLogger(MyUI.class.getName()).log(Level.SEVERE, null, ex); } } Instead of
we use Apache's Derbydatabase. We choose this because that's because it's light-weight, and so easy to distribute. It needs pretty much no installation / configuration etc. We can provide students with a full copy of the application and sample databases, and they can avoid having to spend time setting up and configuring a database server, such as MySQL, and having to import a database. One of the topics we'll be covering on the Hadoop course is the use of the DBInputFormat and DBOutputFormat to read from and write to a relational database (we'll be learning about Sqoop too but the same issue will affect Sqoop... it's just that I've not got to that part of the script just http://stackoverflow.com/questions/33613748/vaadin-sqlsyntaxerrorexception-using-javadb-derby-encountered-limit-at-line-1 yet!). In preparing some data and test code to use on the course, I've today discovered that Hadoop just won't work with Derby. I find this somewhat surprising, given that both projects come from the Apache camp, but having spent several hours digging to find out why this might not work, I've finally found the issue. There's really not much available online about this point so I thought I'd write a blog post about it in the hope that http://mattgreencroft.blogspot.com/2014/06/why-you-cant-use-derby-with-hadoop.html it helps someone in the future avoid the pain I've been through today! On trying to get database reads working, I've been coming up with a horrible looking error message. I won't bore you with the full stack trace; the important part of it is: java.sql.SQLSyntaxErrorException: Syntax error: Encountered "LIMIT" at line 1, column 75. The issue here is that Hadoop generates SQL statements in the background to read from the database. Rather than reading the whole table in one go, each map method call will read the next record. The SQL that Hadoop generates (that we can't see) includes the LIMIT keyword... and as per the derby FAQthis keyword is not supported. So it seems that there's just no easy way to read in or write out to a Derby database from Hadoop. So on the course we'll be using MySQL to learn how to work with relational databases directly from Hadoop, but for anyone using Derby and wanting to work with Hadoop, I think the only option is going to be to create a dump of the data in text format for Hadoop to import. If you have found a way to get Derby working with Hadoop please do let me know! Posted by Matt Greencroft at 07:50 Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest No comments: Post a Comment Newer Post Older Post Home Subscribe to: Post Comments (Atom) Blog Archi
help others java.sql.SQLException: https://samebug.io/exceptions/80470/java.sql.SQLException/syntax-error-encountered--ltnamegt-group-?soft=false Syntax Error. Encountered "